To directly lift a crate .6 meters, Joaquin would need to apply a force of 300 Newtons of force.
Instead, he uses a lever with a mechanical advantage of 3 to lift the crate. How much force
does he save by using the lever?
900 N
297 N
208 N
200 N
To find out how much force Joaquin saved by using the lever, we need to calculate the force he would have needed without the lever and then subtract that from the given 300 Newtons force.
Without the lever, he would have needed to apply the full weight of the crate to lift it .6 meters. Given that the crate weighs 300 Newtons and the distance it needs to be lifted is .6 meters, the work done would be 300 N * .6 m = 180 J.
With the lever, the work done would be the same (180 J), but since the mechanical advantage is 3, the force needed is 1/3 of the original force. Therefore, the force needed with the lever is 300 N / 3 = 100 N.
To find out how much force he saved, we subtract the force with the lever from the original force: 300 N - 100 N = 200 N.
Therefore, Joaquin saved 200 Newtons of force by using the lever.
The correct answer is 200 N.